JP3396584B2 - Laminated glass fiber non-woven fabric - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a laminated glass fiber non-woven fabric for backing, in which polyvinyl chloride is applied on the surface of a second layer and used as a flooring material. More specifically, there is no problem in dimensional stability, a polyvinyl chloride coated processed surface with good flatness is obtained, and there is no problem such as peeling during practical use and it can withstand practical use sufficiently. The present invention relates to a laminated glass fiber non-woven fabric for backing, which can be easily peeled off leaving a thin layer of the first layer having a small unevenness that does not hinder the replacement of the agent.

[0002]

2. Description of the Related Art Conventionally, foamed vinyl chloride sol is coated on the surface of a backing material, gelled by heating, then printed, and then a transparent non-foamed vinyl chloride sol is coated on the foamed vinyl chloride sol layer by heating. Building materials such as flooring materials, wall materials, and ceiling materials are made by foaming. These building materials are constructed with ordinary adhesives, and after being put into practical use, a large amount of the backing material partially remains on the base surface when they are re-attached, resulting in irregularities on the base,
In the state as it is, it is difficult to replace it with a new building material, and there is a great disadvantage that the backing material remaining on the base surface has to be removed with great effort.

As a method for solving such a drawback, for example, in Japanese Patent Publication No. 47-41848, a middle layer of a soft plastic foam is provided on the surface side of a core material layer made of long-fiber nonwoven fabric, and a soft plastic film is further provided thereon. And a soft plastic layer having a dense structure in which a large amount of a filler is mixed is bonded to the back surface of the core material layer.

Further, JP-A-51-99821, JP-A-51-105221, JP-A-51-107902,
No. 51-137930, No. 51-13793
Each of the gazettes of No. 1 is based on the idea that a release agent layer is formed on the back surface of a base such as a floor or wall material in which a surface layer of a base mainly made of paper or non-woven fabric is formed of synthetic resin or the like. Things are listed.

Further, in JP-A-53-76522, a peeling strength is weaker than that of the upper layer and the upper layer, and has a peeling strength weaker than the adhesive strength of the adhesive applied to the floor surface. It is described for floor equipment consisting of at least two layers with a bottom layer of 0.5 mm.

Japanese Patent Publication No. 61-3951 discloses a flooring material composed of a flooring material main body and a backing material, to which a backing material made of non-woven fabric for delamination is fixed to the flooring material main body, and the pores of the non-woven fabric are used as an aqueous emulsion type floor. The flooring material is characterized in that it has a small pore size capable of absorbing almost only water from the adhesive for use, and the interlaminar peeling strength of the backing material is smaller than the peeling strength at the interface between the flooring material main body and the backing material. .

However, in the laminated floor material disclosed in Japanese Patent Publication No. 47-41848, an intermediate layer of soft plastic foam is formed on the surface side of a core material layer made of long-fiber nonwoven fabric, and a transparent soft plastic surface layer is further formed thereon. It is characterized in that it is a laminated floor material formed by bonding and forming a soft plastic layer having a dense structure in which a large amount of filler is mixed on the back surface of the core material layer. In this case, first, Since a soft plastic layer having a dense structure mixed with a large amount of a filler is bonded to the back surface of the core material layer of the laminate, the soft plastic layer having a dense structure is formed only on the surface portion of the long fiber nonwoven fabric constituting the core material layer. Since they are joined and the two are not completely integrated, a person can walk on the floor material, drag a heavy object on the floor material, and repeatedly load locally with a chair with casters. In this case, delamination may occur at the joint surface, and secondly, wrinkles or the like may be prevented when joining a soft plastic layer having a dense structure containing a large amount of filler to the back surface of the core material layer. Therefore, it is necessary to apply tension to the soft plastic layer of the dense tissue, and this tension causes the soft plastic layer of the dense tissue to be bonded to the core material layer with internal strain, resulting in Due to the strain, there is a problem that the floor material shrinks with time, which significantly deteriorates the dimensional stability of the floor material.

Further, Japanese Patent Laid-Open No. 51-99821 and Japanese Utility Model Laid-Open No. 5
No. 1-105221, No. 51-107902, No. 51-137930, No. 51-137931.
In each of the publications, a floor formed by forming a surface layer with a synthetic resin or the like on the surface of a base whose main material is paper or non-woven fabric,
It is characterized in that a release agent layer is formed on the back surface of the base such as a wall material. In this case, the release agent layer on the back surface of the base and the adhesive used to apply the floor material are basically used. Since it does not adhere to the floor, it can be peeled off very easily when peeling the floor material, but because it is easy to peel off, people walk on the floor material or drag heavy objects on the floor material. In addition, when a load is locally applied repeatedly with a chair with casters or the like, peeling occurs at the interface between the release agent layer and the adhesive layer, which is a serious problem in practical use.

Further, in the flooring base material disclosed in Japanese Patent Laid-Open No. 53-76522, peeling is always caused in the lower layer when the substrates are replaced, and the lower layer has a thickness of 50 to 500 .mu.m. The variation in the thickness of the lower layer left behind is as large as a little less than 500 μ, and to apply the adhesive on this and re-attach the flooring material, the variation in the thickness of the lower layer left behind on the base surface must be covered. However, it is uneconomical since it is necessary to apply an extra adhesive agent of about 500 μ at maximum. Also,
There is a problem in that the strength varies due to the uneven thickness of the adhesive, which is not preferable in construction.

In the floor material of Japanese Patent Publication No. Sho 61-3951, the two layers of non-woven fabric are impregnated with a binder so as to be integrated, and the amount of the binder is changed between the non-woven fabric surface and the interface between the two layers. It is described that the amount of binder is adjusted so that the amount of binder at the interface between the two layers is less than that of the surface of the non-woven fabric, but for thin non-woven fabric, the amount of binder at the interface is adjusted to be less than the amount of surface binder by impregnation. This is difficult, and even if the amount of binder at the interface between the two layers can be made smaller than that of the surface of the non-woven fabric, when the surfaces of the non-woven fabric are integrated, the interface will have less binder and less fiber entanglement Since it is not completely integrated, peeling is easy at the time of re-construction, but people walk on the floor material, drag heavy objects on the floor material, casters If you or apply locally repeated load in the chair or the like attached, there is a problem which can not endure the practical use will undergo delamination at the joining surface. In addition, this non-woven fabric is very porous because it can be impregnated with a binder, and the surface is rough, and if polyvinyl chloride is applied to this non-woven fabric, it will permeate the non-woven fabric excessively and unevenly. , In order to obtain a polyvinyl chloride layer with a certain thickness, it is necessary to coat and process an excessive amount of polyvinyl chloride, and there is also the problem that the finished polyvinyl chloride layer can only have poor surface flatness. Was there.

[0011]

DISCLOSURE OF THE INVENTION The present invention is intended to solve these drawbacks, and there is no problem in dimensional stability, and a polyvinyl chloride coated surface having good flatness can be obtained. There is no problem such as peeling during practical use, it can withstand practical use sufficiently, and when the floor material is replaced, it can be easily peeled off leaving a thin layer with small unevenness on the underlying adhesive that does not hinder the replacement. It is an object to provide a composite glass fiber nonwoven fabric.

[0012]

Means for Solving the Problems That is, the present invention is a two-layer composite glass fiber nonwoven fabric, wherein the interlayer strength between the first layer and the second layer is 0.8 kg · cm or more and less than 2 kg · cm, The first layer to be combined has an internal bond strength of 0.8 kg · cm or more, a basis weight of 8 g / m ² or more and 16 g / m ² or less, and the second layer contains glass fibers and a fibrous binder, and has an internal bond strength of the layer. Is 2 kg / c
A composite glass fiber non-woven fabric characterized by having a length of m or more (claim 1). Preferably, the first layer comprises pulp fibers, fibrous binders or pulp fibers,
The combined glass fiber nonwoven fabric according to claim 1, which contains a fibrous binder and a synthetic fiber (claim 2). Also,
The second layer is the composite glass fiber non-woven fabric according to claim 1, which contains pulp fibers (claim 3). The fibrous binder is preferably a PVA fiber, which is the combined glass fiber nonwoven fabric according to claims 1 and 2 (claim 4).

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
In the two-layer composite glass fiber non-woven fabric of the present invention, the interlaminar strength between the first layer and the second layer and the internal bond strength of the layers are 0.
If the weight is less than 8 kg / cm, when a person walks on the flooring material, drags a heavy object on the flooring material, or locally repeatedly applies a load with a chair with casters, delamination and There is a problem in practical use due to intra-layer peeling, and it is necessary to have a practically endurable interlayer strength and internal bond strength of 0.8 kg · cm or more. In addition, at the time of peeling work for replacing the floor material, in consideration of workability, peeling can be carried out between the layers or in the first layer without requiring a great force, and the new floor material can be replaced. It is necessary to keep the interlaminar strength below 2 kg · cm. From the above, the interlayer strength is 0.8 kg ・ cm or more and 2 k
It is less than g · cm. In order to prevent the second layer from remaining as a thick layer due to peeling in the second layer, it can be achieved by setting the internal bond strength of the second layer to 2 kg · cm or more.

Thus, the interlayer strength between the first and second layers is 0.8 kg · cm or more and less than 2 kg · cm, the internal bonding strength of the first layer is 0.8 kg · cm or more, and By setting the internal bond strength of the two layers to 2 kg / cm or more, 0.8 kg / cm or more 2 kg / It is possible to peel easily with a force less than cm.

When the floor material is replaced, the base adhesive after the old floor material is peeled off is the first layer in the case of the intralayer peeling of the first layer.
Part of the layer remains. In the case of delamination of the first layer and the second layer, the first layer is mainly left behind, but even with delamination, the interface formed by combining the first layer and the second layer is completely uniform and flat. Since the interface is not formed by the contact between the surfaces but is formed by the contact between the surfaces having some unevenness, naturally, this interface is an uneven interface, and therefore, in this peeling, Some of the fibers of the second layer are in the first layer and some of the fibers of the first layer are in the second
A small amount adheres to the layer and peels off. In any case, the first layer should be thin so that there is no unevenness on the base after the peeling work, either in-layer peeling or interlayer peeling, but the basis weight of the first layer is 8 g / m ² or more to cover the second layer. is necessary. Further, since it is left as a thin layer after peeling, it is necessary to set it to 16 g / m ² or less in order to make the unevenness inconspicuous even if peeling is partially different in the thickness direction in the first layer. That is, the basis weight is 8 g / m ²
By setting it to 16 g / m ² or less, no matter how thick it is, 5
Since it only remains as a thin layer of less than 0 μ and the variation in the thickness of the remaining layer is less than 50 μ, an extra adhesive that covers this uneven thickness when the floor material is adhered again Has a maximum thickness of 50 μm, which is economical and has good variation in adhesive strength. The density of the layer is 0.3 g / cm ³ or more. Due to the combination of the above internal bonding strength, interlayer strength, and thin first layer, a thin layer with small unevenness that remains in the first layer during peeling work or between the first and second layers is left Is possible.

The first layer contains pulp fibers, fibrous binders, or pulp fibers, fibrous binders and synthetic fibers, and the second layer contains glass fibers, pulp fibers and fibrous binders. The main use of each raw material is the pulp fiber of the first layer for sheet formation, the fibrous binder as an adhesive, the synthetic fiber according to the use of the flooring material, and the glass fiber of the second layer for dimensional stability. The pulp fiber is used for sheet formation, and the fibrous binder is used as an adhesive. By including these, the above characteristics can be realized.

The glass fiber used in the present invention may be any glass fiber as long as it is hard to break and has a fiber sheet forming ability. Generally, the fiber diameter is from 5μ to 13μ.
Fine glass fibers of μ or less can produce excellent texture, but are weak in strength. Thick glass fibers of 13 μ or more improve dimensional stability, but become too thick and have large gaps and poor workability, and further to the skin. It is difficult to use due to its irritation. Regarding the fiber length, it is generally 3 mm to 25 mm, but if it is less than 6 mm, the strength is weak.
If it exceeds mm, the texture is deteriorated, which is not preferable. From the above, a more preferable glass fiber has a fiber diameter of 6 μ or more and 13 μ or less and a fiber length of 6 mm or more and 25 mm or less.

Since the second layer contains glass fibers and a fibrous binder, polyvinyl chloride is applied on the surface of the second layer and is used as a flooring by using a laminated glass fiber non-woven fabric for backing. Since stability and flatness at the time of applying polyvinyl chloride are required, the more preferable addition rate of the glass fiber is 45% or more and 65% or less.

The pulp fibers used in the present invention are conifers,
It is an aggregate of plant fibers extracted from a hardwood or other plant by a mechanical method, a chemical method, or a method in which the above two methods are appropriately combined in between, and either pulp is used alone or in combination. However, since the combined glass non-woven fabric lacks dimensional stability when beaten to a high degree, the freeness is preferably 400 mlcsf or more. However, the flatness of the PVC surface deteriorates because the PVC penetrates too much. Therefore, the preferred freeness is 400 mlcsf or more and 600 mlcs or less.

The fibrous binder used in the present invention includes PVA fiber, viscose fiber, polyester fiber,
Examples thereof include vinylon fibers and various core-sheath fibers, and any fibrous binder may be used as long as the desired effects of the present invention are not impaired. In particular, the PVA fiber used in the examples is preferable, and more specifically, the PVA fiber is a fiber produced under appropriate conditions using an appropriate raw material PVA for the purpose, and it is almost dissolved in water at room temperature. However, when it is heated on the dryer surface after paper making, it begins to melt easily, and if it is pressurized with equipment such as a touch roll at that moment, it will become a fibrous binder across the main fibers. After that, it is re-solidified by subsequent dehydration and drying, and becomes a strong paper layer constituting fiber that does not easily come off unless it is hot water. Various influences on the adhesive force of the fibers can be considered, but they can be roughly classified into three points, that is, softening point in water, fineness, and fiber length. The actual softening point in water is
It indicates the temperature at which the wet paper web receives heat from the dryer and the binder fibers start to melt and exhibit an adhesive function. The lower the PVA fiber having a lower softening point in water, the easier the dissolution of the binder fiber, which is a prerequisite for adhesion, and the greater the adhesive effect. However, the lower the softening point in water, the better the adhesive effect, but to the dryer. Is likely to occur. In order for the PVA fiber to dissolve, the temperature of the wet paper needs to be higher than its softening point in water, and therefore, the higher the drying temperature, the greater the adhesive effect and the higher the strength. When the water temperature in the wet paper is below the softening point of the PVA fibers in water, the binder fibers do not dissolve, and the binder effect is lost at all. For Yankee dryer, steam temperature of dryer is 130
~ 160 ℃, the temperature of the wet paper in contact with this is 6
It is considered that the PVA fiber has a softening point in water of 65 to 85 ° C., so that a sufficient adhesive force can be obtained. As the fineness decreases, the strength increases. This is because when added at the same weight ratio, the number of added fibers is larger and the number of bonding points is larger when the fine fibers are used, so that the adhesive strength is increased.
A fiber is usually 1 denier. The shorter the fiber length, the more uniform the distribution in the slurry at the time of papermaking, and the larger the strength as a result.

The synthetic fibers used in the first layer in the present invention are polyamide type, polyethylene type, polyurethane type, polyethylene type, polystyrene type, polyvinyl chloride type, polyvinylidene chloride type, polyfluoroethylene type, polyacrylic type, polyvinyl type. Examples thereof include alcohol-based ones, but those that are not easily affected by heat during processing and that have excellent dimensional stability should be used in a ratio according to the purpose within a range that does not impair the desired effects of the present invention. Is possible.

In addition to the above, various anionic, nonionic, cationic, or amphoteric retention aids, drainage agents, and dispersions that have been conventionally used within the range of not impairing the desired effects of the present invention. Agent, paper strength improver, internal sizing agent, and sticky agent are appropriately selected and used as necessary.
It is also possible to appropriately add a papermaking internal additive such as a regulator, an antifoaming agent, a pitch control agent, and a slime control agent depending on the purpose.

The papermaking method in the present invention can be carried out, for example, as follows. For the second layer, after adding a nonionic dispersant to water so as to be 3 wt% with respect to glass fiber, glass fiber was added and stirred for about 15 minutes, and then an aqueous polymer polyacrylamide solution was added as a floc agent. It is stored as a glass fiber slurry in a state of being stirred by a reciprocating stirrer, while the pulp fiber after beating and the fibrous binder are mixed and dispersed, and then sent to another storage tank, where these glass fiber slurry, pulp fiber and fibrous binder are mixed. A certain amount of the slurry and the second layer are sent to the paper machine, and the second layer is first made into paper so that the target basis weight is obtained. Next, the first layer mixes and disperses the pulp fiber and the fibrous binder after beating, and then sends the pulp fiber and the fibrous binder slurry to the paper machine by a fixed amount for the first layer, The second layer prepared above is made into paper so that the target basis weight is obtained. Further, this combined sheet can be pressed and then dried so that the surface of the second layer contacts the surface of the Yankee dryer to obtain a glass fiber nonwoven fabric.

A coating liquid containing a pigment and a binder may be smeared on the surface of the second layer surface of the combined glass fiber nonwoven fabric obtained in the present invention for the purpose of keeping polyvinyl chloride.

[0025]

EXAMPLES The present invention is described in detail below with reference to examples and comparative examples, but the invention is not limited thereto. Table 1
Table 2 shows the composition ratio and layer structure of the example, and Table 2 shows the composition ratio and layer structure of the comparative example.

Preparation of Cushion Flooring A two-layer composite glass fiber non-woven fabric sample was cut into a width of 25 cm and a length of 30 cm and preheated with a constant temperature hot air dryer at 110 ° C. for 30 seconds, and then the surface of the first layer was placed on the glass plate. It was placed so as to face downward, and foamed vinyl chloride sol for cushion flooring was applied to the surface of the second layer with an applicator bar having a gap of 0.4 mm, and heated in a constant temperature hot air dryer at 200 ° C. for 20 seconds to cause gelation. Non-foaming transparent PVC sol is further applied to the cooled gelled sheet with a gap of 0.6 mm applicator bar (applying cap is 0.2 mm) and heated for 15 seconds in a constant temperature hot air dryer at 200 ° C. to foam PVC sol. Then, the non-foaming transparent PVC sol was gelated to prepare a cushion flooring material.

Measurement of data in Examples and Comparative Examples is carried out by the following method. Internal bond strength and interlayer strength: TAPPI UM403
Then, the strength was measured using an internal bond tester (Kumagaya Riki Kogyo Co., Ltd.). Residual thickness of the cushion floor material after peeling: The thickness of the cushion floor material prepared by the above method was measured at 20 points after the humidity was adjusted for 24 hours or more in an environment of a temperature of 20 ° C and a humidity of 65%.
Next, a synthetic rubber adhesive is applied to the plywood in an S-shape to the extent necessary for adhesion, that is, a portion where the adhesive is applied and a portion where the adhesive is not applied are formed, and the cushion is provided on the surface. Affix the flooring material, leave it for 1 week in an environment of temperature 20 ° C and humidity 65%, peel it off, and re-measure the thickness at the same place.
The thickness measured before peeling was subtracted from the thickness before adhesion to obtain the residual adhesion thickness. Further, the maximum value was the maximum residual thickness, the minimum value was the minimum residual thickness, and the difference between the maximum value and the minimum value was the variation in the residual thickness. Peelability of cushion floor material: Cushion floor material is attached to plywood with a synthetic rubber adhesive and left for 1 week at room temperature.
It peeled off and the result was observed. It should be noted that the interface formed by combining the first layer and the second layer is not an interface formed by contact between completely flat surfaces, but an interface formed by contact between surfaces having some unevenness. It is an uneven interface. Therefore, in the peeling between the first layer and the second layer, a part of the fibers of the second layer may adhere to the first layer in a small amount. In this case, the peeling also occurs between the first layer and the second layer. It was regarded as peeling and the result was good. -The first layer remains on the plywood --- (-) --- (-) (good) -Even the second layer or more remains on the plywood -------- −− × (Poor) Dimensional stability: Glass fiber nonwoven fabric sasample temperature 2
Humidity is controlled for 24 hours or more in an environment of 0 ° C and 65% humidity, and the length of the sample is accurately measured. This sample at a temperature of 200
The sample was allowed to stand for 3 minutes in hot air having a constant temperature of ℃, and the length of the sample was measured to obtain the shrinkage ratio with respect to the original size. The closer to 0, the better the dimensional stability. According to the conventional empirical rule, the shrinkage ratio is preferably within 0.1% and, at worst, within 0.2%. Flatness of PVC surface: The unevenness of the PVC surface of the cushion flooring material produced by the above method was visually observed, and the one with small unevenness was ranked as 1 and the one with large unevenness was ranked as 1
It was rated 0. Rank 1 is the best, and according to the conventional rule of thumb, ranks 1 to 5 are good, and worse, rank 6
Is desirable. Freeness of pulp: The freeness of pulp was measured according to JIS P 8121.

Example 1 Following the papermaking of the second layer 60 g / m ² at the compounding ratio shown in Table 1,
The first layer of 8 g / m ² was made into a paper, and after pressing, the surface of the second layer was applied to a Yankee dryer to be dried to obtain a made glass fiber nonwoven fabric having a basis weight of 68 g / m ² . The measurement results are shown in Tables 3, 4, and 5.

Example 2 Instead of the composite glass fiber nonwoven fabric used in Example 1,
A laminated glass fiber nonwoven fabric was obtained in the same manner as in Example 1 except that the basis weight of the first layer was changed to 16 g / m ² . Table 3 shows the measurement results
Shown in.

Example 3 Instead of the laminated glass fiber nonwoven fabric used in Example 1,
A machined glass fiber nonwoven fabric having a basis weight of 68 g / m ² was obtained in the same manner as in Example 1 except that the compounding ratio of the second layer was changed to the compounding ratio shown in Table 1. The measurement results are shown in Table 4.

Example 4 Instead of the laminated glass fiber nonwoven fabric used in Example 1,
A machined glass fiber nonwoven fabric having a basis weight of 68 g / m ² was obtained in the same manner as in Example 1 except that the compounding ratio of the second layer was changed to the compounding ratio shown in Table 1. The measurement results are shown in Table 4.

Example 5 Instead of the laminated glass fiber nonwoven fabric used in Example 1,
A machined glass fiber nonwoven fabric having a basis weight of 68 g / m ² was obtained in the same manner as in Example 1 except that the compounding ratio of the second layer was changed to the compounding ratio shown in Table 1. The measurement results are shown in Table 4.

Example 6 Instead of the laminated glass fiber nonwoven fabric used in Example 1,
A machined glass fiber nonwoven fabric having a basis weight of 68 g / m ² was obtained in the same manner as in Example 1 except that the compounding ratio of the first layer and the second layer was changed to the compounding ratio shown in Table 1. The measurement results are shown in Table 5.

Example 7 Instead of the laminated glass fiber nonwoven fabric used in Example 1,
A machined glass fiber nonwoven fabric having a basis weight of 68 g / m ² was obtained in the same manner as in Example 1 except that the compounding ratio of the first layer and the second layer was changed to the compounding ratio shown in Table 1. The measurement results are shown in Table 5.

Example 8 Instead of the composite glass fiber nonwoven fabric used in Example 1,
A machined glass fiber nonwoven fabric having a basis weight of 68 g / m ² was obtained in the same manner as in Example 1 except that the compounding ratio of the first layer and the second layer was changed to the compounding ratio shown in Table 1. The measurement results are shown in Table 5.

Example 9 0.3 part of a dispersant (Aron T40) was added to water, and subsequently 59 parts of calcium carbonate (Softon # 2200) and 41 parts of kaolin (alpha coat) were mixed and stirred to disperse to a concentration of 70. % Dispersion clay was prepared and stored in a tank with stirring. Polyvinyl alcohol (Gothenol A
H17) was mixed with water and heated to a water temperature of 90 ° C. with stirring to prepare a solution having a concentration of 10% and stored in a tank. The dispersion clay, the polyvinyl alcohol solution, and the vinyl chloride latex (Viniblanc 654W) each had a solid content of 10
The mixture was mixed so as to have a ratio of 0/5/8 and adjusted to a concentration of 48%, and a thickening agent sodium alginate (Kergin HV) was added to the above dispersed clay 100 in a viscosity of 1200c.
It was stored as a coating solution of ps (B-type viscometer) while stirring.
The above coating solution was smeared on the second surface of the sheet prepared in Example 1 with an air knife coater at a solid content of 40 g / m ² to prepare a smeared sheet of a composite glass fiber nonwoven fabric having a total basis weight of 108 g / m ² . The measurement results are shown in Table 3.

[0037]

[Table 1]

COMPARATIVE EXAMPLE 1 Instead of the laminated glass fiber nonwoven fabric used in Example 1,
A 66 g / m ² machined glass fiber nonwoven fabric was obtained in the same manner as in Example 1 except that the basis weight of the first layer was changed to 6 g / m ² . The measurement results are shown in Table 3.

Comparative Example 2 Instead of the laminated glass fiber nonwoven fabric used in Example 1,
A 78 g / m ² machined glass fiber nonwoven fabric was obtained in the same manner as in Example 1 except that the basis weight of the first layer was changed to 18 g / m ² . The measurement results are shown in Table 3.

Comparative Example 3 Instead of the composite glass fiber nonwoven fabric used in Example 2,
A composite glass fiber nonwoven fabric having a basis weight of 76 g / m ² was obtained in the same manner as in Example 2 except that the composition ratio of the second layer was changed to the composition ratio shown in Table 2. The measurement results are shown in Table 3.

COMPARATIVE EXAMPLE 4 Instead of the laminated glass fiber nonwoven fabric used in Example 2,
A composite glass fiber nonwoven fabric having a basis weight of 76 g / m ² was obtained in the same manner as in Example 2 except that the composition ratio of the second layer was changed to the composition ratio shown in Table 2. The measurement results are shown in Table 3.

Comparative Example 5 Instead of the nonwoven fabric made of the glass fiber composite used in Example 2,
A composite glass fiber nonwoven fabric having a basis weight of 76 g / m ² was obtained in the same manner as in Example 2 except that the composition ratio of the second layer was changed to the composition ratio shown in Table 2. The measurement results are shown in Table 3.

[0043]

[Table 2]

[0044]

[Table 3] In Comparative Example 1 in which the basis weight of the first layer was 6 g / m ² , the coating of the second layer was insufficient and the synthetic rubber-based adhesive reached the second layer, and even the second layer partially remained. There is a large variation in the residual adhesion thickness, which is a problem. In Comparative Example 2 in which the grammage of the first layer is 18 g / m ² , since the thickness of the first layer is originally present, there is a large variation in the residual thickness and there is a problem. In Comparative Example 3, there is a problem that the internal strength of the first layer is weak and cannot be put to practical use. In Comparative Example 4, since the inner bonding strength of the first layer and the second layer is strong and the interlayer strength is also strong, a force is required to peel it off during rework. In Comparative Example 5, the internal strength of the second layer is weak and it cannot be put to practical use, which is a problem.

[0045]

[Table 4] It is understood that the dimensional stability increases as the glass compounding ratio of the second layer increases, and is 0.21% in Example 3 having a compounding ratio of 40%, which is not preferable, and when the glass compounding ratio of the second layer is 65%, Since the glass nonwoven fabric has open eyes, the flatness of the vinyl chloride surface is poor. From the above, the more preferable range of the glass compounding ratio is from 45% to 65%.

[0046]

[Table 5] It was found that the dimensional stability deteriorated as the beating degree of the pulp increased, and 0.21% in Example 6 having a beating degree of 350 mlcsf.
In addition, in Example 8 having a beating degree of 650 mlcsf, the flatness of the vinyl chloride surface is poor because the eyes of the glass nonwoven fabric are open. Therefore, the more preferable range of the beating degree of pulp is 400 mlcsf. To 600 mlcsf.

[0047]

As described above, according to the present invention,
In a two-layer composite glass fiber nonwoven fabric, the interlayer strength between the first layer and the second layer is 0.8 kg · cm or more and less than 2 kg · cm, and the internal bonding strength of the first layer to be composited is 0.8 kg · cm. cm or more, the basis weight is 8 g / m ² or more and 16 g / m ² or less, and the second layer is a glass fiber nonwoven fabric having a glass fiber and a fibrous binder, and the internal bond strength of the layer is 2 kg · cm or more. Therefore, regarding the laminated glass fiber nonwoven fabric for backing, in which polyvinyl chloride is applied to the surface of the second layer and used as a flooring material, there is no problem in dimensional stability, and polyvinyl chloride is applied with good flatness. The surface is obtained, and there is no problem such as peeling during practical use, and it can withstand practical use sufficiently. In the peeling work when replacing the floor material, the force of 0.8 kg · cm or more and less than 2 kg · cm does not hinder the replacement. A thin layer with small unevenness that does not exist The fruit is obtained.

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Claims (4)

(57) [Claims] 1. In a two-layer composite glass fiber nonwoven fabric, the interlaminar strength between the first and second layers is 0.8 kg · cm or more and less than 2 kg · cm, and the internal bond strength of the first layer to be composited is Is 0.8 kg · cm or more, the basis weight is 8 g / m ² or more and 16 g / m ² or less,
And the second layer contains glass fiber and fibrous binder,
A laminated glass fiber non-woven fabric characterized in that the internal bond strength of the layer is 2 kg · cm or more. 2. The laminated glass fiber non-woven fabric according to claim 1, wherein the first layer contains pulp fibers, a fibrous binder, or pulp fibers, a fibrous binder, and synthetic fibers. 3. The combined glass fiber non-woven fabric according to claim 1, wherein the second layer contains pulp fibers. 4. The combined glass fiber nonwoven fabric according to claim 1, wherein the fibrous binder is PVA fiber.